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(A) Mesenchymal stromal cell (MCS) treatment 4 times after the establishment of ovalbumin (OVA)‐induced acute allergic rhinitis in rats significantly attenuated the expression of immunoglobulin E (IgE) in the serum of the rats. (B) MCS treatment once before or 4 times after the establishment of OVA‐induced acute allergic rhinitis in rats obviously reduced the expression of histamine in the serum of the rats. *P < .05, **P < .01, and ***P < .001
